A power-recoverable electric feedback spindle life test method

Abstract

The present invention discloses a power-recoverable electric feedback type spindle life test method, the method adopts a spindle life test system as a whole, the spindle life test system comprises a spindle placement module, a life estimation module, and an electric feedback module, the spindle placement module is used to place the spindle with detection as a whole therein, the life estimation module is used to estimate the life of the spindle, the electric feedback module is used to perform feedback discharge, the spindle placement module comprises a servo motor drive module, a speed adjustment module, a heat conduction module, and a power adjustment module, the servo motor drive module is used to drive the operation of the spindle to be tested, the speed adjustment module is used to adjust the speed of the servo motor, and the heat conduction module is used to conduct the heat generated during the operation. The present invention has the characteristics of power recovery and comprehensive consideration.

Description

Technical Field

[0001] The invention relates to the technical field of machine tool life testing, in particular to a power-recoverable electric feedback type spindle life testing method. Background Art

[0002] The spindle refers to the axis that receives power from the engine or motor and transmits the force to other parts. It is often used in machine tools. Since the spindle needs to run for a long time, it will generate heat and wear during operation, which will reduce its lifespan over time.

[0003] At present, there is no accurate calculation method for the life of the spindle. Although there is an artificial estimation method of observing the wear of key parts of the spindle under a microscope, this method has a large proportion of human subjective factors and cannot be detected during the operation of the spindle. There is a large error between the observation result and the actual application environment. Studies have shown that when the spindle wear is more serious, it will generate more heat during operation and generate a large amount of heat energy. However, the current understanding of spindle wear is only in the theoretical stage, and there is no relevant test method to apply this feature. The patent with application number 201810052675.9 discloses an electric spindle reliability test bench based on towing loading, which adopts multiple spindles to tow and uses DC bus feedback current through the inverter to achieve the purpose of energy recycling. Although it has the effect of saving energy, it will generate power loss during towing, and the heat energy generated by the operation of the electric spindle is not utilized. Therefore, it is necessary to design a power-recoverable electric feedback spindle life test method with comprehensive consideration of power recovery. Summary of the invention

[0004] The purpose of the present invention is to provide a power-recoverable electric feedback spindle life test method to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a power-recoverable electric feedback spindle life test method, the method adopts a spindle life test system as a whole, the spindle life test system includes a spindle placement module, a life estimation module, and an electric feedback module, the output end of the spindle placement module is electrically connected to the input end of the life estimation module, the output end of the life estimation module is electrically connected to the input end of the electric feedback module, the spindle placement module is used to place the spindle with detection as a whole therein, the life estimation module is used to estimate the life of the spindle, the electric feedback module is used to perform feedback discharge, the spindle placement module includes a servo motor drive module, a speed adjustment module, a heat conduction module, and a power adjustment module, the output end of the servo motor drive module is electrically connected to the input end of the speed adjustment module, the output end of the speed adjustment module and the output end of the heat conduction module are electrically connected to the input end of the power adjustment module, the servo motor drive module is used to drive the operation of the spindle to be tested, the speed adjustment module is used to adjust the speed of the servo motor, the heat conduction module is used to conduct the heat generated during the operation, and the power adjustment module is used to adjust the overall power of the spindle.

[0006] According to the above technical solution, the life estimation module includes a temperature display module, a speed display module, and a health calculation module. The output end of the temperature display module is electrically connected to the input end of the speed display module, and the output end of the speed display module is electrically connected to the input end of the health calculation module. The temperature display module is used to display the current temperature of the spindle, the speed display module is used to display the speed of the spindle under the action of the servo motor, and the health calculation module is used to calculate the life health of the spindle currently being measured.

[0007] According to the above technical solution, the electric feedback module includes a phase change heat storage module, a high-sensitivity steam turbine module, and an electricity terminal module. The heat output end of the phase change heat storage module is electrically connected to the input end of the high-sensitivity steam turbine module, and the output end of the high-sensitivity steam turbine module is electrically connected to the input end of the electricity terminal module. The phase change heat storage module is used to store the heat energy generated during the spindle test using phase change materials. The high-sensitivity steam turbine module is used to convert the received heat energy into kinetic energy to drive the high-sensitivity steam turbine to generate electricity. The electricity terminal module is used to connect various electricity terminals.

[0008] According to the above technical solution, the power-recoverable electric feedback life spindle test method comprises the following steps:

[0009] Step S1: Connect each module in the system;

[0010] Step S2: Install the spindle to be tested into the spindle placement module and wait for testing;

[0011] Step S3: Turn on the switches of each detection submodule, start detecting the spindle to be detected, and record relevant data;

[0012] Step S4: estimating the life of the current spindle according to relevant data;

[0013] Step S5: Using the electric feedback module, the extra power generated by the spindle during the test is used in an electric feedback manner. Different from the currently commonly used electric spindle dragging method, the heat energy generated during the operation of the electric spindle is recycled and utilized, reducing circuit complexity and improving utilization.

[0014] According to the above technical solution, step S3 further includes the following steps:

[0015] Step S31: Turn on the switch of the servo motor drive module and set the initial speed r0; the initial speed is set to prevent the temperature from rising sharply due to excessive speed, which may damage the spindle and affect the detection results;

[0016] Step S32: the spindle to be tested starts running under the drive of the servo motor, and the speed is synchronized with the servo motor;

[0017] Step S33: adjusting the speed of the servo motor according to the set speed increase interval T, and recording the number of additions n; setting the speed increase interval, gradually increasing the speed, making the detected data discretized, and making it easier to draw accurate conclusions;

[0018] Step S34: The heat conduction module detects the temperature C of the spindle in real time and conducts the heat out;

[0019] Step S35: Adjust the operating power of the spindle to operate within an appropriate range.

[0020] According to the above technical solution, step S4 further includes the following steps:

[0021] Step S41: The temperature display module displays the current spindle temperature and draws a temperature change curve based on the historical spindle temperature changes. After the temperature changes tend to be flat, a signal is sent to the speed adjustment module to stop increasing the speed interval. When spindles with different life spans are running, the heat generated at the same speed is not the same, and the spindle temperature is also different. After the spindle reaches the limit speed, the temperature will no longer increase and tend to change smoothly.

[0022] Step S42: The speed display module calculates the speed R of the current spindle after the operating temperature change tends to be flat according to the number of times n of adding the speed increase interval; the speed of the servo motor needs to be measured by a computer or an industrial computer, and setting the initial speed and the increase interval speed facilitates the discretization of the spindle speed increase process, which can more accurately display the temperature change of the spindle during operation;

[0023] Step S43: obtaining the value of the factory temperature-to-speed ratio q of the spindle of the model; after the spindle manufacturer produces the spindle, it is tested using a spindle life test before it leaves the factory, and its factory data is recorded;

[0024] Step S44: Calculate the health of the current spindle based on the obtained data.

[0025] According to the above technical solution, in step S42, the calculation formula of the current spindle speed R after the operating temperature changes gradually becomes stable is:

[0026] R=r0+nT

[0027] Among them, r0 is the initial speed of the servo motor, in rpm, n is the number of speed intervals increased after the spindle is running, T is the set speed interval, in rpm, and the current spindle speed is the highest speed after the temperature change tends to slow down.

[0028] According to the above technical solution, in step S43, the calculation formula of the health of the current spindle is:

[0029]

[0030] Among them, R is the speed of the current spindle after the operating temperature changes tend to be flat, in rpm, C is the extreme value of the current spindle operating temperature, in degrees Celsius, q is the factory value of the temperature-to-speed ratio of the current spindle, in rpm / ℃, the larger the value of Y, the healthier the current spindle is. Due to errors in the production process, the value of Y is not zero.

[0031] According to the above technical solution, step S5 further includes the following steps:

[0032] Step S51: The heat generated by the spindle during the test is transferred to the phase change heat storage module through the heat conduction module for heat storage. The heat is stored and utilized by utilizing the characteristic that the latent heat storage capacity per unit mass or volume during the phase change of the phase change material is very large.

[0033] Step S52: After the phase change material stores heat, it generates working fluid steam to drive the high-sensitivity steam turbine to generate electricity; the motor shaft of the high-sensitivity steam turbine is equipped with a thermistor, which will reduce its resistance when heated, and at the same time, the steam drives the steam turbine to rotate to generate electricity;

[0034] Step S53: The power terminal uses the electricity generated by the high-sensitivity steam turbine to work. The voltage and amplitude used by large machines in the factory are different from those of conventional electricity, and transformers with different specifications and parameters need to be connected to the power hub. For the lighting circuit, only the electricity generated during the spindle test can be used to drive the light bulb, reducing the complexity of the circuit and saving electricity.

[0035] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0036] (1) By providing a speed adjustment module, the servo motor can be adjusted at multiple intervals to facilitate discretization of the temperature change process of the spindle, making the result more accurate;

[0037] (2) By providing a heat conduction module, the heat generated during the spindle test is conducted to reduce the waste of heat energy;

[0038] (3) A health calculation module is provided to calculate the health of the spindle according to the obtained data, thereby preventing industrial accidents caused by severe spindle wear;

[0039] (4) By providing a phase change heat storage module, the heat energy generated during the spindle test is stored using phase change materials to reduce resource waste;

[0040] (5) By installing a high-sensitivity steam turbine module, the characteristics of thermistors are used to generate electricity, reducing the complexity of the circuits within the factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0042] Figure 1 It is a schematic diagram of the system module composition of the present invention. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] See also Figure 1The present invention provides a technical solution: a power-recoverable electric feedback spindle life test method, which adopts a spindle life test system as a whole. The spindle life test system includes a spindle placement module, a life estimation module, and an electric feedback module. The output end of the spindle placement module is electrically connected to the input end of the life estimation module, and the output end of the life estimation module is electrically connected to the input end of the electric feedback module. The spindle placement module is used to place the spindle with detection as a whole therein, the life estimation module is used to estimate the life of the spindle, and the electric feedback module is used to perform feedback discharge. The spindle placement module includes a servo motor drive module, a speed adjustment module, a heat conduction module, and a power adjustment module. The output end of the servo motor drive module is electrically connected to the input end of the speed adjustment module, the output end of the speed adjustment module and the output end of the heat conduction module are electrically connected to the input end of the power adjustment module, the servo motor drive module is used to drive the operation of the spindle to be tested, the speed adjustment module is used to adjust the speed of the servo motor, the heat conduction module is used to conduct the heat generated during the operation, and the power adjustment module is used to adjust the overall power of the spindle.

[0045] The life estimation module includes a temperature display module, a speed display module, and a health calculation module. The output end of the temperature display module is electrically connected to the input end of the speed display module, and the output end of the speed display module is electrically connected to the input end of the health calculation module. The temperature display module is used to display the current temperature of the spindle, the speed display module is used to display the speed of the spindle under the action of the servo motor, and the health calculation module is used to calculate the life health of the spindle currently being measured.

[0046] The electrical feedback module includes a phase change heat storage module, a high-sensitivity steam turbine module, and an electricity terminal module. The heat output end of the phase change heat storage module is electrically connected to the input end of the high-sensitivity steam turbine module, and the output end of the high-sensitivity steam turbine module is electrically connected to the input end of the electricity terminal module. The phase change heat storage module is used to store the heat energy generated during the spindle test using phase change materials. The high-sensitivity steam turbine module is used to convert the received heat energy into kinetic energy to drive the high-sensitivity steam turbine to generate electricity. The electricity terminal module is used to connect various electricity terminals.

[0047] A power-recoverable electric feedback life spindle test method comprises the following steps:

[0048] Step S1: Connect each module in the system;

[0049] Step S2: Install the spindle to be tested into the spindle placement module and wait for testing;

[0050] Step S3: Turn on the switches of each detection submodule, start detecting the spindle to be detected, and record relevant data;

[0051] Step S4: estimating the life of the current spindle according to relevant data;

[0052] Step S5: Using the electric feedback module, the extra power generated by the spindle during the test is utilized in an electric feedback manner.

[0053] Step S3 further comprises the following steps:

[0054] Step S31: Turn on the switch of the servo motor drive module and set the initial speed r0; the initial speed is set to prevent the temperature from rising sharply due to excessive speed, which may damage the spindle and affect the detection results;

[0055] Step S32: the spindle to be tested starts running under the drive of the servo motor, and the speed is synchronized with the servo motor;

[0056] Step S33: adjusting the speed of the servo motor according to the set speed increase interval T, and recording the number of additions n; setting the speed increase interval, gradually increasing the speed, making the detected data discretized, and making it easier to draw accurate conclusions;

[0057] Step S34: The heat conduction module detects the temperature C of the spindle in real time and conducts the heat out;

[0058] Step S35: Adjust the operating power of the spindle to operate within an appropriate range.

[0059] Step S4 further comprises the following steps:

[0060] Step S41: The temperature display module displays the current spindle temperature and draws a temperature change curve based on the historical spindle temperature changes. After the temperature changes tend to be flat, a signal is sent to the speed adjustment module to stop increasing the speed interval. When spindles with different life spans are running, the heat generated at the same speed is not the same, and the spindle temperature is also different. After the spindle reaches the limit speed, the temperature will no longer increase and tend to change smoothly.

[0061] Step S42: The speed display module calculates the speed R of the current spindle after the operating temperature change tends to be flat according to the number of times n of adding the speed increase interval; the speed of the servo motor needs to be measured by a computer or an industrial computer, and setting the initial speed and the increase interval speed facilitates the discretization of the spindle speed increase process, which can more accurately display the temperature change of the spindle during operation;

[0062] Step S43: obtaining the value of the factory temperature-to-speed ratio q of the spindle of the model; after the spindle manufacturer produces the spindle, it is tested using a spindle life test before it leaves the factory, and its factory data is recorded;

[0063] Step S44: Calculate the health of the current spindle based on the obtained data.

[0064] In step S42, the calculation formula of the current spindle speed R after the operating temperature changes gradually becomes stable is:

[0065] R=r0+nT

[0066] Among them, r0 is the initial speed of the servo motor, in rpm, n is the number of speed intervals increased after the spindle is running, T is the set speed interval, in rpm, and the current spindle speed is the highest speed after the temperature change tends to slow down.

[0067] In step S43, the calculation formula for the health of the current spindle is:

[0068]

[0069] Among them, R is the speed of the current spindle after the operating temperature changes tend to be flat, in rpm, C is the extreme value of the current spindle operating temperature, in degrees Celsius, q is the factory value of the temperature-to-speed ratio of the current spindle, in rpm / ℃, the larger the value of Y, the healthier the current spindle is. Due to errors in the production process, the value of Y is not zero.

[0070] Step S5 further comprises the following steps:

[0071] Step S51: The heat generated by the spindle during the test is transferred to the phase change heat storage module through the heat conduction module for heat storage. The heat is stored and utilized by utilizing the characteristic that the latent heat storage capacity per unit mass or volume during the phase change of the phase change material is very large.

[0072] Step S52: After the phase change material stores heat, it generates working fluid steam to drive the high-sensitivity steam turbine to generate electricity; the motor shaft of the high-sensitivity steam turbine is equipped with a thermistor, which will reduce its resistance when heated, and at the same time, the steam drives the steam turbine to rotate to generate electricity;

[0073] Step S53: The power terminal uses the electricity generated by the high-sensitivity steam turbine to work. The voltage and amplitude used by large machines in the factory are different from those of conventional electricity, and transformers with different specifications and parameters need to be connected to the power hub. For the lighting circuit, only the electricity generated during the spindle test can be used to drive the light bulb, reducing the complexity of the circuit and saving electricity.

[0074] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0075] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power-recoverable electric feedback spindle life test method, which overall adopts a spindle life test system, and is characterized by: The spindle life test system includes a spindle placement module, a life estimation module, and an electric feedback module. The output end of the spindle placement module is electrically connected to the input end of the life estimation module, and the output end of the life estimation module is electrically connected to the input end of the electric feedback module. The spindle placement module is used to place the spindle to be tested as a whole therein, the life estimation module is used to estimate the life of the spindle, and the electric feedback module is used to perform feedback discharge. The spindle placement module includes a servo motor drive module, a speed adjustment module, a heat conduction module, and a power adjustment module. The output end of the servo motor drive module is electrically connected to the input end of the speed adjustment module, and the output end of the speed adjustment module is electrically connected to the input end of the power adjustment module. The servo motor drive module is used to drive the operation of the spindle to be tested, the speed adjustment module is used to adjust the speed of the servo motor, the heat conduction module is used to conduct the heat generated during the operation, and the power adjustment module is used to adjust the overall power of the spindle. The life estimation module includes a temperature display module, a speed display module, and a health calculation module. The output end of the temperature display module is electrically connected to the input end of the speed display module, and the output end of the speed display module is electrically connected to the input end of the health calculation module. The temperature display module is used to display the current temperature of the spindle, the speed display module is used to display the speed of the spindle under the action of the servo motor, and the health calculation module is used to calculate the life health of the currently measured spindle; The electric feedback module includes a phase change heat storage module, a high-sensitivity steam turbine module, and an electricity terminal module. The heat output end of the phase change heat storage module is connected to the input end of the high-sensitivity steam turbine module, and the output end of the high-sensitivity steam turbine module is electrically connected to the input end of the electricity terminal module. The phase change heat storage module is used to store the heat energy generated during the spindle test using phase change materials. The high-sensitivity steam turbine module is used to convert the received heat energy into kinetic energy to drive the high-sensitivity steam turbine to generate electricity. The electricity terminal module is used to connect various electricity terminals. The power-recoverable electric feedback life spindle test method comprises the following steps: Step S1: Connect each module in the system; Step S2: Install the spindle to be tested into the spindle placement module and wait for testing; Step S3: Turn on the switches of each detection submodule, start detecting the spindle to be detected, and record relevant data; Step S4: estimating the life of the current spindle according to relevant data; Step S5: using the electric feedback module to utilize the extra power generated by the spindle during the test in an electric feedback manner; The step S3 further comprises the following steps: Step S31: Turn on the switch of the servo motor drive module and set the initial speed r0; Step S32: the spindle to be tested starts running under the drive of the servo motor, and the speed is synchronized with the servo motor; Step S33: adjusting the speed of the servo motor according to the set speed increase interval T, and recording the number of additions n; Step S34: the heat conduction module detects the temperature C of the spindle in real time and conducts the heat out; Step S35: adjusting the operating power of the spindle to operate within a suitable range; The step S4 further comprises the following steps: Step S41: The temperature display module displays the current spindle temperature and draws a temperature change curve according to the historical spindle temperature changes. After the temperature change tends to be flat, a signal is sent to the speed adjustment module to stop increasing the speed interval; Step S42: The speed display module calculates the speed R=r0+nT of the current spindle after the operating temperature changes gradually according to the number of times n of adding the speed growth interval; wherein r0 is the initial speed of the servo motor, in rpm, n is the number of speed intervals added after the spindle is running, T is the set speed interval, in rpm, and the current spindle speed is the highest speed after the temperature changes gradually; Step S43: obtaining the value of the factory temperature-to-speed ratio q of the spindle of this model; Step S44: Calculate the health of the current spindle based on the obtained data Among them, R is the speed of the current spindle after the operating temperature changes tend to be flat, in rpm, C' is the current spindle operating temperature extreme value, in Celsius, q is the factory value of the temperature-to-speed ratio of the current spindle, in rpm / ℃, the larger the value of Y, the healthier the current spindle is. Due to errors in the production process, the value of Y is not zero.

2. The power-recoverable electric feedback spindle life test method according to claim 1, characterized in that: The step S5 further comprises the following steps: Step S51: The heat generated by the spindle during the test is transferred to the phase change heat storage module through the heat conduction module for heat storage; Step S52: After the phase change material stores heat, it generates working fluid steam to drive the high-sensitivity steam turbine to generate electricity; Step S53: The power-consuming terminal uses the electricity generated by the high-sensitivity steam turbine to operate.

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